diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index fb37de4..efb2025 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -31,7 +31,7 @@ use Modules\Support\Models\TicketMapper;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class BackendController extends Controller
+final class BackendController extends Controller
 {
 
     /**
diff --git a/Models/Issue.php b/Models/Issue.php
index 5c48d9e..6153a70 100644
--- a/Models/Issue.php
+++ b/Models/Issue.php
@@ -22,7 +22,7 @@ namespace Modules\Support;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Issue
+final class Issue
 {
     /**
      * Id.
diff --git a/Models/Message.php b/Models/Message.php
index d641089..836a942 100644
--- a/Models/Message.php
+++ b/Models/Message.php
@@ -22,7 +22,7 @@ namespace Modules\Support;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Message
+final class Message
 {
 
     /**
diff --git a/Models/Ticket.php b/Models/Ticket.php
index 0b26ebf..1fce6c0 100644
--- a/Models/Ticket.php
+++ b/Models/Ticket.php
@@ -25,7 +25,7 @@ use Modules\Tasks\Models\TaskType;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Ticket
+final class Ticket
 {
 
     private $id = 0;
diff --git a/Models/TicketMapper.php b/Models/TicketMapper.php
index 23eddcc..4dc6ea7 100644
--- a/Models/TicketMapper.php
+++ b/Models/TicketMapper.php
@@ -29,7 +29,7 @@ use Modules\Tasks\Models\TaskMapper;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class TicketMapper extends DataMapperAbstract
+final class TicketMapper extends DataMapperAbstract
 {
 
     /**